Linked elsewhere in the comments, but this is an interesting read regarding the increasing gap between productivity and labor: https://www.epi.org/publication/understanding-the-historic-d... . The interesting fact is that the loss of labor's share of GDP to capital is less than you'd imagine, and a much bigger reason for stagnant real wage growth has to do with inequality regarding compensation. Automation is real an…
If someone has $100M income after taxes, they might invest $50M reducing the ROI of the capital in economy during the economic boom when there is enough capital and cheap credit already.
What to do with the remaining $50 million? It's hard to eat, travel or use services to spend $50 million per year. It's possible, but it takes some real effort. Helicopter ride every day barely registers.
You can always buy a bigger house. $50 gets you a nice one. If you put $150 million you get even better. Property prices increase.